You should also set the timing. I had never done it. I read the directions on this site and did it with no problem. The timing helped out tremendously. However, if yours is just cutting out or missing I would bet it's the plugs.
I bought a timing light for about $30 and timing only takes about 20 minutes.
Good luck

Is that a prostar 190 I see in your pic? I've got a 91 in the same shade of red. I was told to contact you with questions about my boat lift. The easiest way to explain it would be to tell you to view the thread on general discussion entitled "boat lift issues". It was posted by me (Hoosierfan73). Any ideas you have would be great thanks.